JP2013256227A - Airbag apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag apparatus whose structure is simplified.SOLUTION: Two gas generators 30a and 30b are fitted in the hollows 21a and 21b of a base plate 20, and covered with a cover member 40 from above. A sealed gas discharge path reaching an airbag 50 from the gas outlets 32a and 32b of the two gas generators 30a and 30b, is formed by the cover member 40 and the base plate 20.

Description

  The present invention relates to an airbag device including a gas generator.

BACKGROUND ART A vehicle airbag device is a device that inflates gas generated from a gas generator by introducing it into an airbag and protects passengers and the like in the event of a collision.
In order to adjust the deployment of the airbag at the time of a collision, a dual type gas generator having independent combustion chambers may be used by a plurality of ignition devices.
For example, in a pyro type gas generator in which a gas source for generating inflation gas of an air bag is made of a solid gas generating agent, such a dual type can be achieved with one gas generator. Although easy, the internal structure of the gas generator is complicated.

  On the other hand, the gas generator to be used is a single type having a single ignition device and one corresponding combustion chamber, and a plurality of single type gas generators are assembled in an airbag module, and a dual type gas generator is installed. An airbag system that maintains the same deployment performance as the module used is known.

In the inflator 10 of Patent Document 1, ignition devices 50 and 52 are respectively attached to one end portions of a cylindrical gas generator composed of two housings 12 and 14, and opposite ends thereof are opposed to each other and connected by an insulating tube 20. doing.
A heat radiation orifice 21 is formed in the insulating tube 20 to prevent the heat from being transferred to the other inflator when one inflator is activated. And when incorporating in an airbag module, it will incorporate in this state.

U.S. Patent No. 6,095,561

  An object of the present invention is to provide an airbag device that has a simplified structure and is easy to assemble.

The invention of claim 1 is a solution to the problem.
A base plate, two gas generators fixed to one surface side of the base plate, a cover member covering the two gas generators from the one surface side, and an airbag accommodated in contact with the base plate An airbag device comprising:
The base plate has a depression on one side, and a through hole is formed in the depression,
The two gas generators are arranged so as to be spaced apart from each other in the depression, and a gap communicating with the through hole is formed between each gas outlet and the depression,
The cover member covers the two gas generators such that a gap is formed between the two gas generators;
The airbag is accommodated so that the gas inlet covers the through hole in the recess from the other surface side of the base plate,
The airbag, the base plate, and the cover member are
A frame-shaped airbag mounting member arranged in contact with the gas inlet of the airbag from the inside, the base plate, and the cover member are integrally fixed by fastening means,
The two gas generators are fixed by a recess of the base plate and the cover member,
Provided is an airbag device in which a sealed gas discharge path from the gas discharge port of the two gas generators to the gas inlet port of the airbag is formed by the cover member and the base plate.

The airbag device of the present invention is a combination of a base plate, two gas generators, a cover member, and an airbag.
The base plate has a recess. The portion excluding the recess of the base plate is preferably a flat surface, but the portion excluding the recess may have a curved surface.
The base plate may have a side wall surface on each side. For example, when the base plate is a quadrangle, one having a side wall surface on one side, one having a side wall surface on two adjacent sides, and a side wall surface on two opposite sides. It has what has a side wall surface in three sides, what has a side wall surface in four sides. The base plate may have a shape other than a square, for example, a circular shape. In that case, an annular side wall may be formed around the base plate.
When the base plate has a side wall surface, it may be a side wall surface extending in the same direction as the protruding direction of the recess or a side wall surface extending in the direction opposite to the protruding direction of the recess.
Those having side wall surfaces in the same direction on the four sides have a shape similar to a box shape (there is no equivalent to a lid).

The airbag is accommodated in contact with the base plate in a folded state. When the base plate also has a side wall surface as described above, it may be accommodated in contact with the side wall surface.
The two gas generators are fitted into a recess on one surface (first surface) side of the base plate, and are covered with a cover member from above.
The airbag, the base plate, and the cover member are integrated by fastening means (for example, a combination of a bolt and a nut) by using a frame-like airbag mounting member.

  In the airbag apparatus of the present invention, the shape and size of each member are adjusted in advance in accordance with the shape and size of the two gas generators, so that the two gas generators are formed by the recess of the base plate and the cover member. A fixed gas discharge path is also secured from the gas discharge ports of the two gas generators to the gas inlet of the airbag.

  Two gas generators used in the airbag apparatus of the present invention are a pyro type that generates gas by combustion of a solid gas generating agent filled in a housing, and a stored type that uses pressurized gas filled in the housing. Any of the hybrid type in which both elements are combined may be used, but it is preferable to use a pyro type gas generator in terms of small size and light weight. Two gas generators having different maximum outputs can be combined.

The invention of claim 2 is a solution to the problem.
The two gas generators are
The outer shape is cylindrical, and has a plurality of gas discharge ports in the annular region on the peripheral surface on one end surface side, and the outer diameter of the peripheral surface of the annular region in which the gas discharge ports are formed is outside the remaining peripheral surface. Smaller than the diameter,
The end faces on the side on which the plurality of gas discharge ports are formed face each other, and are arranged at intervals in the recess of the base plate,
The base plate, the two gas generators, and the cover member;
An annular gap is formed between the inner surface of the cover member, the circumferential surface of the annular region in which the gas discharge port is formed, and the recessed surface of the base plate,
The airbag apparatus according to claim 1, wherein the annular gap communicates with a through hole formed in a recess of the base plate to form the gas discharge path.

In the airbag device described above, a gas discharge path is formed from the two gas discharge ports to the annular gap, the through hole formed in the recess of the base plate, and the gas introduction port of the airbag.
The two gas discharge ports and the through hole formed in the recess of the base plate are communicated with each other through an annular gap, but they are opposed to each other from the viewpoint of ensuring gas discharge in the gas discharge path. It is preferable.

  The two gas generators may be arranged at intervals in the vertical direction so that their axes coincide with each other, or may be arranged in parallel at intervals, but are arranged in the vertical direction. Preferably it is.

The invention of claim 3 is a solution to the problem.
The airbag apparatus according to claim 2, wherein a width in which the end faces of the two gas generators face each other is 0.1 to 2 times an outer diameter of the gas generator.

The end faces of the two gas generators are separated from each other, and the distance between the end faces is the distance indicated by the above dimensions. This interval is to prevent the influence when one gas generator is operated on the other, for example, when using a pyro type gas generator that generates an expanded gas by combustion of a gas generating agent, It becomes a heat insulation layer that prevents the other gas generator from operating due to thermal influence during operation.
When the outer diameters of the two gas generators are different, it can be determined according to the gas generator having the larger outer diameter. Preferably, this value can be 0.3 to 1 times, more preferably 0.5 to 0.8 times.

The invention of claim 4 is a solution to the problem.
Having at least one of a protrusion protruding outward in the recess of the base plate and a protrusion protruding from the inner surface of the cover member;
The air according to any one of claims 1 to 3, wherein the protrusion is located between the gas generators arranged at intervals and is in contact with the two gas generators. A bag device is provided.

By providing the projection on one or both of the base plate and the cover member, the distance between the two gas generators is maintained. For this reason, it is prevented that two gas generators move or collide with each other due to deformation of the end face that is opposed to each other during operation. Especially when a pyro type gas generator is used, one of the gas generators When activated, the other gas generator is prevented from having a thermal effect.
A plurality of independent protrusions may be formed in the circumferential direction, and the protrusion may be a continuous annular protrusion.

The invention of claim 5 is a solution to the problem.
Having at least one of a protrusion protruding outward in the recess of the base plate and a protrusion protruding from the inner surface of the cover member;
The protrusion is such that the width on the lower side is larger than the width on the top side,
The protrusion is positioned between the gas generators arranged at intervals, and is in contact with the two gas generators;
The airbag apparatus according to any one of claims 1 to 3, wherein the annular regions or annular gaps of the two gas generators communicate with each other.

When the protrusion is such that the width of the lower side (the surface side where the base plate is depressed and the inner surface side of the cover member) is larger than the width of the top side, the lower side comes into contact with the adjacent gas generator Thus, it functions to maintain the space between the gas generators. At this time, a gap exists between the inclined surface from the lower side to the top side and the gas generator.
For example, such protrusions may have a cross-sectional shape in the width direction that is a triangle, a trapezoid, or a similar shape (substantially triangular or substantially trapezoidal). The portions (surfaces) corresponding to the sides of the triangle or trapezoid need not be straight lines, but may be curved lines (curved surfaces).

When the gas generator is activated, when the housing is deformed by an increase in internal pressure, the housing is deformed so as to swell from the central portion of the surface.
When the outer shape of the two gas generators is cylindrical, and the end surfaces on the side where the plurality of gas discharge ports are formed are arranged facing each other, the internal pressure of the gas generator increases. Thus, the end face is deformed so as to swell from the central portion.
At this time, if the protrusion is as described above, the inclined surface and the expanded gas generator (the end surface facing the housing) do not come into contact with each other. It is possible to prevent the discharge path from becoming narrow or blocked.

The invention of claim 6 is a means for solving the problems.
A base plate having an opening, two gas generators, a cover member covering the two gas generators, an airbag accommodated in contact with the base plate, both the airbag and the gas generator An airbag device having a holding member for holding
The holding member has a recess formed in one surface of the flat plate portion and the flat plate portion, and a plurality of communication holes are formed in the recess,
The two gas generators are in the opening of the base plate and spaced from each other in the recess of the holding member, and a gap is formed between each gas discharge port and the recess to communicate with the through hole. Arranged so that
The cover member covers the gas discharge ports of the two gas generators so as to form a gap;
The airbag, the holding member, the base plate, and the cover member are
The holding member is placed from the gas inlet of the airbag into the inside, and the flat plate portion is disposed in contact with the gas inlet from the inside,
The holding member, the airbag, the base plate, and the cover member are integrally fixed by fastening means,
The two gas generators are fixed by a depression of the holding member, an opening of the base plate and the cover member;
Provided is an airbag apparatus in which a sealed gas discharge path from the gas discharge ports of the plurality of gas generators to the gas inlet port of the airbag is formed by the cover member, the base plate, and the holding member. To do.

The airbag device of the present invention is a combination of a base plate, two gas generators, a cover member, an airbag, and holding members for both the airbag and the gas generator.
The base plate has an opening. The portion excluding the opening of the base plate is preferably a flat surface, but the portion excluding the opening may have a curved surface.
The base plate may have a side wall surface on each side. For example, when the base plate is a quadrangle, one having a side wall surface on one side, one having a side wall surface on two adjacent sides, and a side wall surface on two opposite sides. It has what has a side wall surface in three sides, what has a side wall surface in four sides. The base plate may have a shape other than a square, for example, a circular shape. In that case, an annular side wall may be formed around the base plate.
When the base plate has a side wall surface, it may be a side wall surface extending in the same direction as the protruding direction of the recess or a side wall surface extending in the direction opposite to the protruding direction of the recess.
Those having side wall surfaces in the same direction on the four sides have a shape similar to a box shape (there is no equivalent to a lid).

The airbag is accommodated in contact with the base plate in a folded state. When the base plate also has a side wall surface as described above, it may be accommodated in contact with the side wall surface.
The two gas generators are arranged in a space formed by a combination of a base plate and a holding member, and are covered with a cover member from above.
The airbag, the base plate, the holding member, and the cover member housed in the base plate are integrated by fastening means (for example, a combination of a bolt and a nut).
And by adjusting the shape and size of each member in advance corresponding to the shape and size of the two gas generators, the two gas generators are fixed by the base plate, the holding member and the cover member, Furthermore, a gas discharge path from the gas discharge ports of the two gas generators to the gas inlet port of the airbag is also secured. Two gas generators with different maximum outputs may be combined.

The overall structure of the airbag device of the present invention is simplified, and assembly is facilitated.
And since it is not necessary to connect or connect two gas generators beforehand, and it can assemble only by combining with other components, an assembly man-hour is reduced and manufacturing cost is also suppressed.

The disassembled perspective view of an airbag apparatus (the perspective view for demonstrating the assembly method). The side view of the airbag apparatus when assembled from the state of FIG. The schematic sectional drawing of the width direction in the state which turned FIG. 2 upside down. The elements on larger scale of the airbag apparatus of FIG. FIG. 1 is an exploded perspective view of an airbag device according to an embodiment different from FIG. 1 (a perspective view for explaining an assembly method). The side view of the airbag apparatus when assembled from the state of FIG. Furthermore, the schematic sectional drawing of the width direction of the airbag apparatus of another embodiment.

(1) The airbag apparatus of FIGS. 1-3 The airbag apparatus of FIG. 1 is provided with the base plate 20, the two gas generators 30a and 30b, the cover member 40, and the airbag 50. FIG.

  1, the base plate 20 has a first surface 20a on the upper surface (front surface) side and a second surface 20b on the lower surface (back surface) side, and further has four side wall surfaces 20c extending in the same direction. Yes. The first surface 20a and the second surface 20b are rectangular.

The base plate 20 is formed with a depression protruding from the first surface 20a toward the second surface 20b.
The depression is composed of a first depression 21a into which the first gas generator 30a is fitted and a second depression 21b into which the second gas generator 30b is fitted.
The first recess 21a and the second recess 21b have lengths and widths corresponding to the axial length and width (diameter) of the first gas generator 30a and the second gas generator 30b, respectively, and have the same cross-sectional shape. belongs to.

The depth (D1) of the first recess 21a and the second recess 21b is smaller than the radial width (diameter D2) of the first gas generator 30a and the second gas generator 30b (D1 <D2). When the gas generator 30a and the second gas generator 30b are fitted in the first recess 21a and the second recess 21b, respectively, the first gas generator 30a and the second gas generator 30b are introduced from the first surface 20a of the base plate 20. Is in a state of being protruded.
In the case of the embodiment of FIG. 1, the depths of the first recess 21a and the second recess 21b are the same as the radii of the housings of the first gas generator 30a and the second gas generator 30b, respectively. The generator 30a and the second gas generator 30b are half-fitted in the first recess 21a and the second recess 21b in the radial direction, and the other half protrudes from the first surface 20a of the base plate 20. (D1 = D2 / 2).

A well-known gas generator can be used for the 1st gas generator 30a and the 2nd gas generator 30b which are fitted in the 1st hollow 21a and the 2nd hollow 21b.
For example, it is possible to use a pyro-type gas generator (without an attachment member indicated by 33) that generates combustion gas by burning a solid gas generating agent as disclosed in JP-A-10-315900. it can.
The first gas generator 30a and the second gas generator 30b used in FIG. 1 have the same housing diameter, but have different lengths in the direction of the axis X, and the filling amounts of the gas generating agents are different. . The first gas generator 30a has a generated gas mole number of 2.1 moles, the second gas generator 30b has a generated gas mole number of 1 mole, and the first gas generator 30a has a larger maximum output.

The first gas generator 30a and the second gas generator 30b each have a cylindrical housing, and have gas discharge ports 32a and 32b on the peripheral wall surfaces 31a and 31b, respectively.
The first gas generator 30a and the second gas generator 30b are aligned with each other so that the first end face 33a of the first gas generator 30a and the first end face 33b of the second gas generator 30b face each other. The base plate 20 is fitted into the first recess 21a and the second recess 21b with a space therebetween.
The end face (second end face 34a) opposite to the first end face 33a of the first gas generator 30a has a connecting portion 35 for connecting a connector 90 connected to flow an ignition current to the ignition device. Similarly, the end surface (second end surface 34b) opposite to the first end surface 33b of the second gas generator 30b also has a connecting portion (not shown).

The gas discharge ports 32a of the first gas generator 30a are formed in the circumferential direction at equal intervals in the annular discharge port region 36a on the first end surface 33a side of the peripheral wall surface 31a. The annular outlet region 36a has an outer diameter smaller than that of the other peripheral wall surface 31a.
The gas discharge ports 32b of the second gas generator 30b are formed in the circumferential direction at equal intervals in an annular discharge region 36b on the first end surface 33b side of the peripheral wall surface 31b. The annular discharge port region 36b has an outer diameter smaller than that of the other peripheral wall surface 31b.
The formation position and the number of gas discharge ports are not particularly limited as long as the problems of the present invention can be solved.

In the first recess 21a of the base plate 20, a first communication hole 25a that connects the first surface 20a and the second surface 20b is formed in a portion corresponding to the discharge port region 36a.
In the 2nd hollow 21b of the base board 20, the 2nd communicating hole 25b which connects the 1st surface 20a and the 2nd surface 20b is formed in the part corresponding to the discharge port area | region 36b.
The outer diameters of the peripheral wall surface 31a of the first gas generator 30a and the peripheral wall surface 31b of the second gas generator 30b are small in the discharge port regions 36a and 36b.
Therefore, when the first gas generator 30a is fitted in the first recess 21a and the second gas generator 30b is fitted in the second recess 21b, a gap 60a is formed between the discharge port region 36a and the first recess 21a. A gap 60b is formed between the discharge port region 36b and the second recess 21b.
And the peripheral wall surfaces 31a and 31b except the discharge port area | regions 36a and 36b are contacting the surface of the 1st hollow 21a and the 2nd hollow 21b, respectively.

Between the first dent 21a and the second dent 21b (boundary part), a protrusion 22 that protrudes in the direction of the first surface 20a in the circumferential direction (in FIG. 1, 22 indicates a part different from the protrusion). , Please fix) is formed.
Each of the first recess 21a and the second recess 21b is formed with a fixed wall surface 23 at an end opposite to the protrusion 22, and each fixed wall surface 23 has a recess 24 whose part is recessed in the axial direction. Have.
When the first gas generator 30a is fitted into the first depression 21a, the second end face 34a is brought into contact with the fixed wall surface 23, and when the second gas generator 30b is fitted into the second depression 21b, the second end face 34b is brought into contact with the fixed wall surface 23, and the respective gas generators are fixed in the recesses.
As described above, when the first gas generator 30a is fitted into the first depression 21a and the second gas generator 30b is fitted into the second depression 21b, a space is formed between the second end face 34a and the recess 24. And a space is formed between the second end surface 34 b and the recess 24. The space formed by these two recesses 24 becomes a fitting space when the connector 90 is connected to each connection portion 35 of the first gas generator 30a and the second gas generator 30b.

A cover member 40 is further mounted on the first gas generator 30a and the second gas generator 30b fitted in the first recess 21a and the second recess 21b of the base plate 20.
The cover member 40 covers the entire peripheral wall surfaces 31a and 31b of the first gas generator 30a and the second gas generator 30b, but covers the peripheral wall surfaces 31a and 31b including the respective discharge port regions 36a and 36b. As long as it is attached.
The cover member 40 has a peripheral surface portion 41 corresponding to the shape of the housing peripheral wall surfaces 31a and 31b of the first gas generator 30a and the second gas generator 30b, and the peripheral surface portion 41 is formed on the peripheral wall surfaces 31a and 31b. It is covered in a contact state. The peripheral surface portion 41 in contact with the peripheral wall surfaces 31a and 31b also functions as a fixing member for the first gas generator 30a and the second gas generator 30b.
However, since the discharge port regions 36a and 36b have a smaller outer diameter than the other peripheral wall surfaces 31a and 31b, the peripheral surface portion 41 of the cover member 40 does not come into contact with the discharge port regions 36a and 36b, and the gap 61a and 61b are formed.

The cover member 40 has two end portions 42 that are in contact with the second end faces 34a and 34b of the first gas generator 30a and the second gas generator 30b at both ends, and is further protruded inwardly to form a circumference. It has the protrusion 43 formed continuously in the direction.
In the state of FIG. 1, the first gas generator 30 a and the second gas generator 30 b are sandwiched between the cover member 40 and the base plate 20, and both the first end surfaces 33 a and 33 b are the protrusion 22 and the protrusion 43. And is fixed with a space 70 (add 70 to FIG. 2).

The cross-sectional shape in the width direction of the protrusion 22 formed between the first recess 21a and the second recess 21b and the cross-sectional shape in the width direction of the protrusion 43 formed in the cover member 40 are substantially as shown in FIG. Can be triangular.
This is because when the first end face 33a of the first gas generator 30a and the first end face 33b of the second gas generator 30b are deformed during operation, the amount of deformation increases toward the center of each end face. Even in such a deformation, if the cross-sectional shape is substantially triangular, the projections 22 and 43 do not collide as shown in FIG.
When the projections 22 and 43 collide with the respective end surfaces, the base plate 20 may be deformed or the gas generator 30 may move from the base plate 20, but this is prevented in the airbag device of the present invention. Further, the presence of the space 70 prevents the thermal effect when the first gas generator 30a is activated from reaching the second gas generator 30b, thereby preventing the second gas generator 30b from being erroneously activated. .

In the first gas generator 30a, a first annular discharge path to the first communication hole 25a is formed by a gap 60a between the base plate 20 and a gap 61a between the cover member 40.
In the second gas generator 30b, a second annular discharge path to the second communication hole 25b is formed by the gap 60b between the base plate 20 and the gap 61b between the cover member 40.
The first annular discharge path and the second annular discharge path are communicated by the protrusion 22 and the protrusion 43 being in contact with the first end faces 33a and 33b of the first gas generator 30a and the second gas generator 30b, respectively. Without being communicated via the space 70.

The cover member 40 has a fastening portion 44 that is attached to the first surface 20 a of the base plate 20.
The fastening portion 44 is a flat surface extending outward from both ends of the semicircular circumferential surface portion 41, and has a plurality of holes 44a through which bolts pass.

On the second surface 20b side of the base plate 20, the airbag 50 is accommodated in a state of being folded in contact with the second surface 20b.
The airbag 50 is attached so that the gas introduction port 51 covers the first depression 21a and the second depression 21b, and is a frame-shaped air having a plurality of bolts 53 attached to the edge of the gas introduction port 51. The bag holding member 52 is used for fixing.

The airbag apparatus shown in FIGS. 1-3 can be assembled as follows, for example. The assembly order is not particularly limited.
First, the airbag holding member 52 is inserted into the airbag 50 from the gas inlet 51.
Next, the plurality of bolts 53 fixed to the airbag holding member 52 are passed from the inside to the outside through the plurality of through holes 55 formed around the gas introduction port 51.
Next, the bolt 53 is passed through a hole formed in the base plate 20.
Next, two gas generators (first gas generator 30a and second gas generator 30b) are fitted into the two recesses in the base plate 20 with the first end faces 33a and 33b facing each other. At this time, the circumferential direction and alignment of the two gas generators are not necessary.
Next, the cover member 40 is covered from above the two gas generators, and the bolt 53 is passed through the hole 44 a formed in the fastening portion 44 of the cover member 40.
Thereafter, the nut 72 is used for fastening.

The airbag apparatus of the present invention covers the first gas generator 30a and the second gas generator 30b with the base plate 20 and the cover as shown in FIGS. The air bag 50 and the base plate 20 can also be fixed between the members 40.
In the assembled airbag device, the first and second gas discharge paths of the first gas generator 30 a and the second gas generator 30 b are connected to the gas inlet 51 of the airbag 50.

Next, the operation of the airbag apparatus shown in FIG. 1 will be described with reference to FIGS.
When an impact is detected in the airbag device, depending on the magnitude of the impact,
(I) When only the first gas generator 30a operates,
(II) When only the second gas generator 30b operates,
(III) When the first gas generator 30a operates first, and then the second gas generator 30b operates,
(IV) When the second gas generator 30b is activated first and then the first gas generator 30a is activated,
(V) When the first gas generator 30a and the second gas generator 30b operate simultaneously,
The following five operating states can be implemented.
In the following, the operation state (III) will be described as an example.

When the ignition current is transmitted to the ignition device of the first gas generator 30a via the connector 90, the first gas generator 30a is activated by the operation of the ignition device, and a predetermined amount of combustion gas is generated.
The combustion gas reaches the first communication hole 25a from the gas discharge port 32a through the cover member 40 (circumferential surface portion 41), the discharge port region 36a, and the annular gaps 60a and 61a formed by the protrusions 22 and 43.
Thereafter, the gas is discharged from the gas inlet 51 into the airbag 50 through the first communication hole 25a, and the airbag 50 is inflated.
Thereafter, when an ignition current is supplied to the ignition device of the second gas generator 30b with a delay, and the second gas generator 30b is activated, the combustion gas is similarly discharged from the gas discharge port 32b, and the cover member 40 (the peripheral surface portion 41). ), Passes through annular annular gaps 60b and 61b formed by the discharge port region 36b and the protrusions 22 and 43, and reaches the second communication hole 25b.
And it is discharged | emitted from the gas inlet 51 inside the airbag 50, and the airbag 50 is further expanded.

At this time, the housing of the first gas generator 30a that operates first is at a high temperature due to heat generated during operation.
In some cases, the end face (first end face 33a) may be deformed toward the outside (the second gas generator 30b side) due to the pressure inside the housing.
However, in the airbag device of the present invention, since the space 70 is formed between the first end surface 33b of the second gas generator 30b, the first end surface 33a of the first gas generator 30a generates the second gas. There is no contact with the first end face 33b of the container 30b.
In the airbag apparatus shown in FIGS. 1 to 3, when the housing diameters (outer diameters) of the first gas generator 30a and the second gas generator 30b are both 60 mm, the space 70 has a width in the range of 6 to 120 mm. can do. The width of the space 70 is preferably in the range of 0.3 to 1 times the outer diameter. In this case, 18 to 60 mm is preferable.
Since the width of the space 70 is ensured in this way, even if the first end face 33a is deformed after the operation of the first gas generator 30a, the first end face 33b of the second gas generator 30b does not come into contact with the heat. Effects are avoided. Even if the first end face 33b is similarly deformed during the operation of the second gas generator 30b, it does not contact the first end face 33a of the first gas generator 30a.
Therefore, the base plate 20 is not deformed, and the first gas generator 30a and the second gas generator 30b are not shifted and the gas discharge path is not narrowed or blocked.

(2) Airbag device shown in FIGS. 5 and 6 The air bag device shown in FIGS. 5 and 6 has the same first gas generator 30a and second gas generator 30b as the gas generator shown in FIG. However, the base plate 20 and the cover member 40 are partially different.
In the following description, different parts will be mainly described, and the same components as those in FIG.

The base plate 120 has a first recess 121a that houses the first gas generator 30a and a second recess 121b that houses the second gas generator 30b.
A plurality of communication holes 125 are formed in the circumferential direction on the first recess 121a side. The formation position of the communication hole 125 is a position corresponding to the central portion of the gas introduction port 51 of the airbag 50.

A plurality of independent protrusions 122 are formed on the base plate 120.
A plurality of independent protrusions 143 formed on the cover member 140 are formed.
Therefore, the protrusion 122 and the protrusion 143 are in contact with the first end surface 33a and the first end surface 33b, but the base plate 120 and the cover member 140 are not connected to the first end surface 33a and the first end surface 33 in a portion where the protrusion 122 and the protrusion 143 are not provided. It is not in contact with one end face 33b.
5 and 6, the space 70 between the first gas generator 30a and the second gas generator 30b communicates with the annular gaps 60a and 61a and the annular gaps 60b and 61b.

5 and 6, the gas generated from the first gas generator 30a is introduced into the airbag 50 through the communication hole 125 from the first discharge region 36a. However, a part of the gas flows into the air bag 50 after flowing into the space 70 from the annular gaps 60a and 61a.
On the other hand, the combustion gas discharged from the second gas generator 30b flows into the space 70 through the annular gaps 60b and 61b.
Then, it flows into the annular gaps 60 a and 61 a, passes through the communication hole 125, and is discharged to the airbag 50.

  In the airbag apparatus shown in FIGS. 5 and 6, since the communication hole 125 is formed so as to be positioned at the center of the airbag introduction port 51, the airbag 50 is inflated evenly during operation. Therefore, there is no bias in the deployment of the airbag 50, and the personnel restraining performance is further improved.

(3) Airbag device in FIG. 7 The air bag device in FIG. 7 is different from the air bag device in FIGS. 1 to 3 in addition to the base plate and the cover member in order to hold the gas generator. The difference is that the generator holding member is used together. 7 corresponds to FIG.
Below, it demonstrates centering around difference with the airbag apparatus of FIGS. 1-3, and it shows that the same number as FIGS. 1-3 is the same.

In the airbag device of FIG. 7, an opening 27 is formed in a portion corresponding to the depression of the base plate 20 of FIG.
The first gas generator 30a and the second gas generator 30b are fitted into the opening 27.
The length and width of the opening 27 in the axial direction have a length and a width that can accommodate the first gas generator 30a and the second gas generator 30b.

An airbag holding member 252 is disposed on the second surface 20 b side of the base plate 20.
The holding member 252 has a flat plate portion 255 and a depression (first depression and second depression) 221 formed on one surface of the flat plate portion 255, and a plurality of communication holes 225 are formed in the depression 221.
The same bolt 253 as the bolt 53 in FIG. 1 is fixed to a flat plate portion (a portion without a recess) 255 of the holding member 252.
In the recess of the holding member 252, the same protrusion as the protrusion 22 of FIG. 1 may be formed.
The flat plate portion 255 corresponds to the bottom surface (first surface 20a and second surface 20b) of the base plate 20 in FIG. 1, and the recesses (first recess and second recess) 221 are formed on the bottom surface of the base plate 20 in FIG. It is the same as the 1st hollow 21a and the 2nd hollow 21b which were made.

  The communication hole 225 formed in the recess 221 of the holding member is composed of two communication holes formed in the same manner as the first communication hole 25a and the second communication hole 25b in FIG.

  The first gas generator 30 a and the second gas generator 30 b are fitted into the recesses (first recess and second recess) 221 of the holding member 252 from the opening 27 of the base plate 20.

The cover member 40 is the same as that shown in FIG. 1, and covers the first gas generator 30a and the second gas generator 30b as in FIG.
The cover member 40 has the same protrusion 43 as that shown in FIG. 1, and maintains a space 70 between the first gas generator 30a and the second gas generator 30b.

The airbag apparatus shown in FIG. 7 can be assembled as follows, for example. This will be described with reference to FIG. The assembly order is not particularly limited.
First, the airbag holding member 252 is inserted into the airbag 50 from the gas introduction port 51.
Next, the plurality of bolts of the airbag holding member 252 are passed from the inside to the outside through each of the plurality of through holes 55 formed around the gas introduction port 51.
Next, the bolt is passed through a hole formed in the base plate 20.
Next, two gas generators (a first gas generator 30a and a second gas generator 30b) are formed with the first end faces 33a and 33b facing each other in a recess formed by the opening of the base plate 20 and the airbag holding member 252. ). At this time, the circumferential direction and alignment of the two gas generators are not necessary.
Next, the cover member 40 is covered from above the two gas generators, and the bolt is passed through the hole formed in the fastening portion 44 of the cover member 40.
Thereafter, the nut 72 is used for fastening.
As shown in FIG. 7, the airbag apparatus assembled in this manner includes two gas generators (first gas generator 30 a and second gas generator 30 b), a holding member 252, a base plate 20, and a cover member. 40 and the airbag 50 and the base plate 20 are also fixed. The gas discharge paths of the two gas generators (first gas generator 30a and second gas generator 30b) are connected to the gas inlet 51 of the airbag 50. In FIG. 7, the shapes of the protrusions 22 and 43 and the positions where the communication holes 225 are formed can be formed as in the embodiment shown in FIGS.

  The airbag apparatus of FIG. 7 can operate in the same manner as the airbag apparatus of FIGS.

20 base plate 30a first gas generator 30b second gas generator 40 cover member 50 airbag

Between the 1st hollow 21a and the 2nd hollow 21b (boundary part), the protrusion 22 continued in the circumferential direction protruded in the 1st surface 20a direction is formed.
Each of the first recess 21a and the second recess 21b is formed with a fixed wall surface 23 at an end opposite to the protrusion 22, and each fixed wall surface 23 has a recess 24 whose part is recessed in the axial direction. Have.
When the first gas generator 30a is fitted into the first depression 21a, the second end face 34a is brought into contact with the fixed wall surface 23, and when the second gas generator 30b is fitted into the second depression 21b, the second end face 34b is brought into contact with the fixed wall surface 23, and the respective gas generators are fixed in the recesses.
As described above, when the first gas generator 30a is fitted into the first depression 21a and the second gas generator 30b is fitted into the second depression 21b, a space is formed between the second end face 34a and the recess 24. And a space is formed between the second end surface 34 b and the recess 24. The space formed by these two recesses 24 becomes a fitting space when the connector 90 is connected to each connection portion 35 of the first gas generator 30a and the second gas generator 30b.

The cover member 40 has two end portions 42 that are in contact with the second end surfaces 34a and 34b of the first gas generator 30a and the second gas generator 30b at both ends, and is further protruded inwardly to form a circumference. It has the protrusion 43 formed continuously in the direction.
In the state of FIG. 1, the first gas generator 30 a and the second gas generator 30 b are sandwiched between the cover member 40 and the base plate 20, and both the first end surfaces 33 a and 33 b are the protrusion 22 and the protrusion 43. And is fixed with a space 70 therebetween.

Claims (6)

A base plate, two gas generators fixed to one surface side of the base plate, a cover member covering the two gas generators from the one surface side, and an airbag accommodated in contact with the base plate An airbag device comprising:
The base plate has a depression on one side, and a through hole is formed in the depression,
The two gas generators are arranged so as to be spaced apart from each other in the depression, and a gap communicating with the through hole is formed between each gas outlet and the depression,
The cover member covers the two gas generators such that a gap is formed between the two gas generators;
The airbag is accommodated so that the gas inlet covers the through hole in the recess from the other surface side of the base plate,
The airbag, the base plate, and the cover member are
A frame-shaped airbag mounting member arranged in contact with the gas inlet of the airbag from the inside, the base plate, and the cover member are integrally fixed by fastening means,
The two gas generators are fixed by a recess of the base plate and the cover member,
An airbag device in which a sealed gas discharge path from the gas discharge ports of the two gas generators to the gas introduction port of the airbag is formed by the cover member and the base plate. The two gas generators are
The outer shape is cylindrical, and has a plurality of gas discharge ports in the annular region on the peripheral surface on one end surface side, and the outer diameter of the peripheral surface of the annular region in which the gas discharge ports are formed is outside the remaining peripheral surface. Smaller than the diameter,
The end faces on the side on which the plurality of gas discharge ports are formed face each other, and are arranged at intervals in the recess of the base plate,
The base plate, the two gas generators, and the cover member;
An annular gap is formed between the inner surface of the cover member, the circumferential surface of the annular region in which the gas discharge port is formed, and the recessed surface of the base plate,
The airbag apparatus according to claim 1, wherein the annular gap is communicated with a through hole formed in a recess of the base plate to form the gas discharge path.   The airbag apparatus according to claim 2, wherein the width of the two gas generators facing each other is 0.1 to 2 times the outer diameter of the gas generator. Having at least one of a protrusion protruding outward in the recess of the base plate and a protrusion protruding from the inner surface of the cover member;
The air according to any one of claims 1 to 3, wherein the protrusion is located between the gas generators arranged at intervals and is in contact with the two gas generators. Bag device. Having at least one of a protrusion protruding outward in the recess of the base plate and a protrusion protruding from the inner surface of the cover member;
The protrusion is such that the width on the lower side is larger than the width on the top side,
The protrusion is positioned between the gas generators arranged at intervals, and is in contact with the two gas generators;
The airbag apparatus according to any one of claims 1 to 3, wherein the annular regions or annular gaps of the two gas generators communicate with each other. A base plate having an opening, two gas generators, a cover member covering the two gas generators, an airbag accommodated in contact with the base plate, both the airbag and the gas generator An airbag device having a holding member for holding
The holding member has a recess formed in one surface of the flat plate portion and the flat plate portion, and a plurality of communication holes are formed in the recess,
The two gas generators are in the opening of the base plate and spaced from each other in the recess of the holding member, and a gap is formed between each gas discharge port and the recess to communicate with the through hole. Arranged so that
The cover member covers the gas discharge ports of the two gas generators so as to form a gap;
The airbag, the holding member, the base plate, and the cover member are
The holding member is placed from the gas inlet of the airbag into the inside, and the flat plate portion is disposed in contact with the gas inlet from the inside,
The holding member, the airbag, the base plate, and the cover member are integrally fixed by fastening means,
The two gas generators are fixed by a depression of the holding member, an opening of the base plate and the cover member;
An airbag apparatus in which a sealed gas discharge path is formed from the gas discharge ports of the plurality of gas generators to the gas inlet port of the airbag by the cover member, the base plate, and the holding member.

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